Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cdc990644b87e8…

MALICIOUS

PDF

94.3 KB Created: 2021-09-09 02:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b292dd6968889468a36645baa0dd714 SHA-1: 747e897925e44790a51f97be8c19007b527a43ca SHA-256: c6cdc990644b87e8fa210dac422547d8087925bdf2c637162446679122f71118
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, forming a link farm. Several heuristics indicate the PDF is designed to host links to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=dragon+pearl+book+pdf PDF link annotation
    • http://carmakers.cz/userfiles/files/xalowinikuzidig.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/92436651985.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zizateramezusopubuwopar.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/kigusijajukunegu.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/linirakekegitese.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/98276443255.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/60427521998.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/gabenavexupave.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/xofotamazod.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/69452383832.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef4f4ebe8---pazokovej.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d27a4832b---jafulox.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b952a6b07---83997597172.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc2026bf4---sonumukedazetafewujozumo.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/malajagapab.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/laperobedokam.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/52862572671.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/dusazupegim.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/xapamuxitit.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4iuo5eephhanj50013flaqmpj1/pokinububoxuk.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/61834871343.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/xifuperimidexuwowuro.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/gomusovobuketogajevisitot.pdfIn PDF document text
    • http://eichler-kammerer.de/24858319872.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 10548 bytes
SHA-256: f9d78d6fff6a0c595b13891b4d2ac96234bf980340cc820aae7ec6c4a6e8a06a
font_02_sfnt_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 17356 bytes
SHA-256: 6a2097b4d5ed08713fe66480e11919b3ecdb3d7d87cd5c3df7a9e00a23ff3845

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